~$ curl http://api.db-ip.com/v2/free/46.52.186.138
{
    "ipAddress": "46.52.186.138",
	"continentCode": "EU",
	"continentName": "Europe",
	"countryCode": "RU",
	"countryName": "Russian Federation",
	"stateProv": "Moscow",
	"city": "Moscow (Northern Administrative Okrug)",
}

~$ curl http://api.db-ip.com/v2/free/46.52.186.138/countryName
Russian Federation

The free API is limited to 1,000 daily requests and returns city level location data only, if you require larger query volumes or more information such as latitude/longitude, ISP details or threat level assessment, please see our commercial offers.